1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
/* -*- Mode: C; indent-tabs-mode:t ; c-basic-offset:8 -*- */
/*
* libusb example program for hotplug API
* Copyright © 2012-2013 Nathan Hjelm <hjelmn@mac.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdlib.h>
#include <stdio.h>
#include "libusb.h"
int done = 0;
libusb_device_handle *handle = NULL;
static int LIBUSB_CALL hotplug_callback(libusb_context *ctx, libusb_device *dev, libusb_hotplug_event event, void *user_data)
{
struct libusb_device_descriptor desc;
int rc;
rc = libusb_get_device_descriptor(dev, &desc);
if (LIBUSB_SUCCESS != rc) {
fprintf (stderr, "Error getting device descriptor\n");
}
printf ("Device attached: %04x:%04x\n", desc.idVendor, desc.idProduct);
if (handle) {
libusb_close (handle);
handle = NULL;
}
rc = libusb_open (dev, &handle);
if (LIBUSB_SUCCESS != rc) {
fprintf (stderr, "Error opening device\n");
}
done++;
return 0;
}
static int LIBUSB_CALL hotplug_callback_detach(libusb_context *ctx, libusb_device *dev, libusb_hotplug_event event, void *user_data)
{
printf ("Device detached\n");
if (handle) {
libusb_close (handle);
handle = NULL;
}
done++;
return 0;
}
int main(int argc, char *argv[])
{
libusb_hotplug_callback_handle hp[2];
int product_id, vendor_id, class_id;
int rc;
vendor_id = (argc > 1) ? strtol (argv[1], NULL, 0) : 0x045a;
product_id = (argc > 2) ? strtol (argv[2], NULL, 0) : 0x5005;
class_id = (argc > 3) ? strtol (argv[3], NULL, 0) : LIBUSB_HOTPLUG_MATCH_ANY;
rc = libusb_init (NULL);
if (rc < 0)
{
printf("failed to initialise libusb: %s\n", libusb_error_name(rc));
return EXIT_FAILURE;
}
if (!libusb_has_capability (LIBUSB_CAP_HAS_HOTPLUG)) {
printf ("Hotplug capabilites are not supported on this platform\n");
libusb_exit (NULL);
return EXIT_FAILURE;
}
rc = libusb_hotplug_register_callback (NULL, LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED, 0, vendor_id,
product_id, class_id, hotplug_callback, NULL, &hp[0]);
if (LIBUSB_SUCCESS != rc) {
fprintf (stderr, "Error registering callback 0\n");
libusb_exit (NULL);
return EXIT_FAILURE;
}
rc = libusb_hotplug_register_callback (NULL, LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT, 0, vendor_id,
product_id,class_id, hotplug_callback_detach, NULL, &hp[1]);
if (LIBUSB_SUCCESS != rc) {
fprintf (stderr, "Error registering callback 1\n");
libusb_exit (NULL);
return EXIT_FAILURE;
}
while (done < 2) {
rc = libusb_handle_events (NULL);
if (rc < 0)
printf("libusb_handle_events() failed: %s\n", libusb_error_name(rc));
}
if (handle) {
libusb_close (handle);
}
libusb_exit (NULL);
return EXIT_SUCCESS;
}
|
